Icosikaioctagon or Icosioctagon Number | C # program for above approach ; Finding the nth icosikaioctagonal number ; Driver code
using System ; class GFG { public static int icosikaioctagonalNum ( int n ) { return ( 26 * n * n - 24 * n ) / 2 ; } public static void Main ( ) { int n = 3 ; Console . Write ( "3rd ▁ icosikaioctagonal ▁ Number ▁ is ▁ = ▁ " + icosikaioctagonalNum ( n ) ) ; } }